We all know the equation E=MC2.  We’ve all read about Einstein's theory of general relativity.  But how many of us know what it means, how it came to be and how relevant it might be today, one-hundred years after it was put forth.

Much has been written about Einstein, but Pedro Ferreira in The Perfect Theory: A Century of Geniuses and the Battle over General Relativity gives us a real biography of general relativity and explains why we should still care.

My conversation with Pedro Ferreira: